We assume that all functions values and their partial derivatives: \(f^1\) , \(f^2\) , \(f^1_{xi}\) , \(f^2_{xi}\) , \(f^2_{yi}\)  are uniformly bounded in a neighborhood of the considered solution (cf. assumptions (H1) and (H2) in [1]}). Furthermore, in the neighborhood, matrices \(F^1_{X+}\) , \(F^2_{X+}\)  are invertible and their elements uniformly bounded. Therefore, there exists \(0<L<+\infty \)  such that \(\Vert z\Vert \le L\)  and \(\Vert w\Vert \le L\) .
